import hashlib, redis

cache = redis.Redis()

def cached_llm(prompt: str) -> str:
    key = "llm:" + hashlib.sha256(prompt.encode()).hexdigest()
    cached = cache.get(key)
    if cached: return cached.decode()

    response = llm(prompt)
    cache.setex(key, 3600, response)  # 1 saat TTL
    return response